红外生命探测仪用光学系统的设计

为了使红外生命探测仪的光学系统具有更大的探测范围,提出了一种新型红外双视场光学探测系统.该光学系统为变焦距光学系统,它利用轴向移动变焦方式使透镜组实现变倍和温度补偿,简化了机电系统结构.该光学系统的工作波段为8～14μm,焦距为35～140 mm,变倍比为3倍.由于选择锗(Ge)和硒化锌(ZnSe)作为透镜材料,F数≥...

Design of Optical System for Infrared Life Detection

To let the optical system of an infrared life detector have a larger detection area,a new infrared dual field of view optical detection system is proposed.The optical system is a zoom system. Because its lens group zooms and compensates temperature by axial motion,its electromechanical system is simplified.The system has an operation wave band of 8 to 14μm,a focal range of 35 to 140 mm and a zoom ratio of 3.Since it uses Ge and ZnSe materials for its lens,its F number is greater than 1.1 which meets the cold shield efficiency of 100%.It has a modulation transfer function greater than 0.5 at the spatial frequency of 15 lp/mm.After the temperature range of the optical system and the parameters of its lens group are defined,the imaging quality of the optical system is evaluated with the OSLO LT optical design software.The result shows that the optical system can meet the practical imaging requirement.